Charge-discharge curve estimation device and charge-discharge curve estimation method of a rechargeable battery

Abstract

A charge-discharge estimation device derives and sets as a prior estimation function an approximate curve of an initial open-end voltage function and initial impedance function to be corrected a first time. A measurement unit measures a charge-discharge voltage and a charge-discharge current in a cycle of a predetermined time. An estimation calculation processing unit obtains an estimated error between a measured voltage and a prior estimation voltage obtained from the prior estimation function, and obtains a posterior estimation value by applying, to the calculated estimated error and a current value, a correction expression using a Gaussian function having a predetermined learning rate Land correction width a as terms, corrects the prior estimation function based on the calculated posterior estimation value, sets a new prior estimation function, and estimates a charge-discharge curve.